Which of the Following Statements About Supply and Demand Relationships

Which of the following statements about supply and demand relationships and their effects on pricing structure is NOT ?

A) The relatively high U.S.wage rate has adversely affected demand for U.S.produced goods
B) There are a few common cost factors which affect many basic U.S.industries
C) Sources of raw materials imported to the U.S.may be cut off,greatly increasing the cost of producing with those materials from other sources
D) All of the above are true